That's surprisingly close to the list I had in mind. I also just ordered a Tantalus after the index came out--I've wanted one for years and they finally made it worth taking. The theme is it's the Archon's personal hunting party, with him on his pleasure barge leading his menagerie of flying playthings including Razorwing flocks, flyers, skimmers, and Hellions. No boots on the ground at all, kind of like the old Kabalite Stormsurge formation.

Side question, I've only ever fielded about 5-6 of these at a time and they do ok, but not spectacular. Am I missing something just running them with a beastmaster or so I simply need moar birds?

So the magic sauce with the Razorwing Flock list is it exploits 3 of the fundamental issues with 8th edition's core rules. These are:

- Everything is capable of wounding everything else.

- Weak unit point balance caps where their effectiveness flatlines.

- There is nothing in the game to punish large numbers of tightly packed, weak units.

The first point is exploited because the Razorwing Flocks, in spite of being S2, are able to wound a Space Marine with equal effectiveness as a Knight Titan. Because their damage ceiling is so low, this means they are equally effective against virtually every single unit in the game. This ties in with the second point, which is that they are balanced around wounding a Space Marine on a 6. Thus they have a lot of attacks, can reroll to hit with a Beastmaster, and have various other benefits such as high wound counts with no saves to help them kill and survive combat with that hypothetical Space Marine without raw Strength or Toughness on their side. The issue is this helps them kill everything else equally well. The third point is mostly that the game has seen the removal of Instant Death, Blasts, Templates, Rampage, etc. Rules that players could use to counter tactics like this no longer exist or are not nearly as functional as they once were. The result is that weaker units balanced around being weak are inadvertently extremely powerful in large numbers.

Basically, when this baby hits 88 birds per list, you're going to see some serious ****.

Further, that's 5.98 Unsaved against ANYTHING at least T4 with a 3+. So enough to degrade your average vehicle, wipe out a Tac Squad, or put some serious hurt on a Wraithknight.

Against Guardsmen, the Birds can kill 23.23, arguably the most effective horde killing tool we have at our disposal.

Birds are, unequivocally, one of the most versatile killers we have in our arsenal, and between their impressive damage output, high mobility, cost, and just a blasted difficult number of wounds, I'd say they're one of the strongest units in our codex at the moment.